<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">{{obj.name}}</div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.14/dist/vue.js"></script>
    <script>
        new Vue({
            data(){
                return {obj: {name: 'peiqi'}}
            },
            mounted(){
                setTimeout(() => this.$delete(this.obj, 'name'), 2000);
            }
        }).$mount('#app')
    </script>
</body>
</html>